Ok this one is for those who have great memories. This is a T87F thermostat sold for years. It was discontinued because it used mercury. I remember the fights in my house with dad and mom trying to determine the right temperature. Daddy always wanted it cold (he wanted to save money) mom always wanted it a little hotter, the fights were endless, dad 67 and mom 76 hahahahahahaha. ONe thing was clear, neither my sister or I could touch it. We replaced ours not long ago, ours came with the hosue.
Now thermostat are way different, they are digital and you can even talk to them. SHARE if you knew what it was........